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A car accelerates uniformly from rest at a rate of plus 10ms2 How far will the car travel in 4s?
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∙ 14y ago
=160m
Wiki User
∙ 14y ago
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You drop a ball from a cliff it lands 4 seconds later what is the balls average speed during the 1st second it is in free fall?
The basic equation for average velocity is distance over time. However, if the velocity is changing uniformly, as it is in free fall, you can use initial velocity plus final velocity divided by two. That makes this problem easy. In free fall the object accelerates at 9.8 m/ss. That means every second it picks up 9.8 m/s of speed. So if is dropped from rest, then one second later its speed will be 9.8 m/s. Its average speed during that time is then initial velocity = 0 plus final velocity = 9.8 divided by 2, to get ; 4.9 m/s.
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